Noise reduction method and device for passive capacitive fingerprint identification system
A fingerprint recognition, passive technology, used in character and pattern recognition, acquisition/organization of fingerprints/palmprints, print image capture, etc., can solve the problems of data transmission errors, large noise, increase and so on
Active Publication Date: 2019-10-15
CHIPONE TECH BEIJINGCO LTD
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[0003] However, in actual use, an increase in the amplitude of the excitation signal will inevitably require an increase in the power supply voltage of the fingerprint sensor chip, which will introduce greater noise, resulting in data transmission errors
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[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some of the embodiments of the present disclosure, but not all of them. Based on the described embodiments of the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative effort fall within the protection scope of the present disclosure.
[0033] figure 1 An example block diagram of a passive capacitive fingerprint sensing system 100 is shown. Such as figure 1 As shown, the passive capacitive fingerprint sensing system 100 includes a fingerprint sensor module 101 and a power supply module 102 . The power supply module 102 is connected to the system power supply voltag...
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A noise reduction method and device for a passive capacitive fingerprint recognition system, the passive capacitive fingerprint recognition system comprising a fingerprint sensor module and a power supply module for providing a time-varying first power supply voltage signal and a second power supply voltage signal to the fingerprint sensor module , the voltage difference between the first power supply voltage signal and the second power supply voltage signal remains constant, and the noise reduction method includes: detecting whether the first power supply voltage signal jumps during data transmission across power domains of the fingerprint sensor module change; if the first power supply voltage signal jumps, then suspend the cross-power domain data transmission of the fingerprint sensor module during the jump. By suspending the cross-power domain data transmission between the fingerprint sensor module and the outside world during the transition of the power supply voltage signal of the fingerprint sensor module, errors in cross-power domain data transmission caused by the transition can be reduced or even eliminated.
Description
technical field [0001] The present disclosure relates to the field of fingerprint identification, in particular, to a noise reduction method and device for a passive capacitive fingerprint identification system. Background technique [0002] Capacitive fingerprint recognition can be divided into active capacitive fingerprint recognition and passive capacitive fingerprint recognition according to whether the excitation signal is directly applied to the finger. The principle of active capacitive fingerprint recognition is mainly to apply an excitation signal to the finger to enhance the charge on the surface of the finger, and use the sensing array of the touch panel to receive the electric field signal and amplify the signal. Due to the inconsistency of the fingerprint, the induced electric field is also inconsistent. This extracts fingerprint information. The working principle of the passive type is to obtain fingerprint information according to the influence of the ridge a...
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IPC IPC(8): G06K9/00
CPCG06V40/1306
Inventor 李卓赵帆
Owner CHIPONE TECH BEIJINGCO LTD